Malicious PDF — malware analysis report

Static analysis result for SHA-256 9874c2a2d59f00cb…

MALICIOUS

PDF

79.7 KB Created: 2021-02-23 00:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ca522ac2375831dfc441da6411ecb989 SHA-1: 2370f9dc988e0a6ebecad6d5b6715346170f7355 SHA-256: 9874c2a2d59f00cbb3beab8cac4df67cd62adc38444281fadaecfc2908be8d4f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains a link to a suspicious URL, identified by heuristics as an external URI. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'English beginner classes', suggesting a social engineering lure to direct users to the malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/123?utm_term=english+beginner+classes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374203/normal_600dc90a847df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463785/normal_6031c6c43770d.pdfIn PDF document text
    • http://fofafik.iblogger.org/57599308625.pdfIn PDF document text
    • http://tetutunugu.iblogger.org/protoplast_culture_and_somatic_hybridization.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365607/normal_600015dde6888.pdfIn PDF document text
    • http://kujisasu.iblogger.org/vunoxogavono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_6033a3f8991d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390097/normal_601fd4fbdc66c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vilaxetewutino.epizy.com/bhojpuri_gana_video_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/blade_and_soul_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/phet_tutorial_projectile_motion_mastering_physics_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/damozulikole.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/gi_bleeding_management_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/18981402379.pdfIn PDF document text
    • http://besowotu.epizy.com/after_life_apk_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/mosizakumej.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 4756 bytes
SHA-256: 031e03b06115bbe9437507bc6283c7c5b5282d9373a66256a8d5488766e7b0a0
font_01_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 10552 bytes
SHA-256: 268b64088c65bb257820da567050cc205392d3a5d9377188f1bca255effa892d
font_02_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
font_03_sfnt_off000123b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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